I think that’s what the quote you chopped out was suppose to tell you. The tendency to sin innate in all human beings. Wikipedia give this:
This condition has been characterized in many ways, ranging from something as insignificant as a slight deficiency, or a tendency toward sin yet without collective guilt, referred to as a “sin nature”, to something as drastic as total depravity or automatic guilt of all humans through collective guilt.
I think the idea is that we born into a world in which sin is all around us and within us, and it’s only through God’s grace that we are even able to seek salvation through Christ and become part of a new “society” of those who believe and follow him, we can’t get there on our own.